Pocket level



Feb. 27, 1923.

E. G. D. HARMSEN.

POCKET LEVEL.

FILED SEPT. 24| 1920.

Witness 1,447,078.' E. G. D. HARMSEN.

I POCKET'LEVEL. FILED sEPT.24. 1920.

2 SHEETS-SHEET 2.

satelite ret. 27, reas.

stares,

reifen.

ENRIQUE c. nonnina' :annnrsnm or nncinimn snUsaL, vra TRUJILLO, riinu.

' rocnnr Lnvnn Application filed SeptemherZ/i, 1920. Serial No. 412,596. i

To zZZwwm-z'tmayconcern': n

.Be it known that I, lirradrfny G. DOERING Harmsen, a citizen of Peru, residing atl Hacienda, Sausal, viaTrujillo, Peru, South America, have'invented new and useful Improvements in Pocket Levels, of which the following is a specification.

My invention relates to improvements in combination level and. angle-measuring'i-nstruments. An object vof the invention is it may be convenientlyv carried, andone that will be largeenough when placed inopera-k tion to` give reliable results. A further object is to provide a compact assemblyof aplurality of instruments, such as a compass, level, and an angle-measuring device 1n one structure which can be economically manu-y..

tion and shows the movable arm in different positions and the closed positions.

Fig. 2 is a top plan View of the shown in full lines in Fig. 1. K

Fig. 3 is a vertical longitudinal section quadrant `inoperative and parts `through the arm and base of my improved' combination instrument showing the arm in one of its open positions.

.,Fig. 4 is a vertical transverse section through the movable and base.

Figs. 5 and 6 are vertical sections of the telescope showing the eye piece and crosshairs, respectively.

The numeral 10 designates a base and itl willl be understood that this base as well as otherparts of the structure of this kdevice may be of any suitable material or materials,

such as wood, aluminum, bronze, brass or steel.` One end of thisbase is cut awayso as to form stepped portions 11 and 12, the step 12 having'the limiting edge 13 for a purposethat will hereinafter appear.

The opposite end of the base is also cut away so as to form a recess in which the projecting end 14 of an arm 2O is pivotally v to provide an instrument of the type above referred to which can be folded to suitable'v size `so that arm, level, telescope supported by means of a bolt 15 passing through. apertures in the projecting end 14k of the arm and; recessed portion 16 -of the` base.

A nut 17. having .al knurled ange is `mounted upon the threaded end of the .bolt

forreleasing the arm for rotational move.. ment and for: locking saidarm inla-djusted positions. The nut 17 is preferably .internally recessed and inthisrecess is placeduaV coil spring 18 which bears against the, end 14 and the interior of the iange for yieldingly holding the ,armQO in the desired position `with a kforce ydepending for intensity upon thel position of the nut l 17 on thev tnt15. 4 l

The end 14 of the arm 20 is an annular enlargement of the 4rbody of fthe arm, the` lower surtface of which, when infclosed yposi- V tion, is inthe same horizontal plane as thel axis of the bolt 15,.so that said arm, when in folded position will contactv with the upper surface ofthe base 10. The arm 20 is shorter than the base, but to its free vend issecured a slotted pointer'21 havinga reduced end 22 that fits-into a corresponding opening in the arm 2O and islocked lthereto by means of a screw 23. Wheny in locked position the vlower surface of thepointer forms a continuation of the ,lower surface of thearm. Y '1 I 4 The arm 2() is provided with, an opening..

.the upper diameter ofv which is reduced by the flange 24. A level "tube is v inserted through` the bottom of the' opening in `thearm. :The level, tube is retained vin place bythe plates 25 4and .screws 26. The Atop and bottom' of the tube are marked with lines whereby the relative position of the bubble lcan be readily ascertained when viewed from below as well as freni above.

rlhe arm 2O has a recess in its upper sury face of dimensions suiiicient to receive a compass case 30 provided with a transparent top-plate 31 and containing aV magnetic needle 32 and graduated jdial33. Thecompass case 30 is retained in place by means of the threaded stud 34 projecting therefrom and engaging thel arm 20.

The movable arm is also equipped with a sighting tube 35 which is secured to one side of the arm 2O preferably bymeans of the stirrups 36 and screws 37 extending 'l through ears on said stirrups and engaging the arm 20. vThe sighting tube is provided with an adjustable eye piece 38 having a plate 39 With an aperture 402 therein and a disc 4:1 carrying cross-hairs or lines etthed on glass so that the object sighted may be denitelylocated in the field or view oit the telescope. Care must be exercised in sembling the tube to the arm in order that the artis of the tube may be exactly parallel to the axis of the movable arm and pointer.

To the recessed portion-l1 ot' the base l0 is pivotally secured a graduated arc e0, the center of which is the point at which movable arm 2O is pivoted to the base i0. This arc is preferably made or' metal and adapted to be received Within the slot oit the pointer 2l. One end of the arc e0 is triangular in shape and apertured so as to receive a bolt ila which is threaded at one end ior the nut 42. The nut i2 is formed with a lrnurled iange similar to the Vflange of nut 17 previously described. To the base l is secured a pin i3 Which projects outwardly a suiiicient distance to contact with one of the sides ot the triangular' end of tl e arc shaped strip s0 in order to limit the movement of the arc to the correct position.

The base l() has a bore 46, ot which the axis is in the same plane With the longitudinal axis 'or the tube 35 but perpendicular thereto, when the movable arm isin zero position. A circular bed plate 50 is provided with a central hole l'adapted to receive the vertical pivot pin (not shown) of'a tripod. 'llhis bed plate is graduated into 3600 and for measuring horizontal angles the edge 13, which lies in the same vertical plane as the center oi hole l and aXis o the tube 35, is the index marlr or pointer for indicating the reading on the graduated bedI plate. ln view of the fact that the 3600 circle is rather large to carry in the pocket, it is divided into tvv'o sections, and these sections are vconnected so as to fold along the line indicated at 52 lin Fig. 2 preferably by suitable hinges (not shown). The bed plate is also provided With the holes s4, through which screws or bolts may be inserted for fastening the circle against rotation on the head of the tripod.

The instrument can be used to measure the inclination of any suriace by placing the base in contact with the surface and rotating the movable arm 20 until the air bubble is in the center of the level tube. The pointer will then indicate the correct degree of inclination on the graduated are which has previously been placed in operative position. ln folded position the arm 2O is horizontal and the arc t() is folded through the slot of pointer 2l until it engages one of the upper edges of the arm as shovvn b v dotted lines in Fig. l. lt will be seen that this arrangement gives a compact combination instrument that can be readily carried A about.

When the bed plate 50 is used, it is carried in folded position and, when the destination is reached assembled on a tripod by means of screws passing through holes 45. The pivot pin of the tripod (not shown) is also inserted through hole 5l of the bed plate and hole 46 ot the base which is superposed on the bed plate. The base and arm may new swing about the pivot tor measuring the horizontal angle between objects sighted through the telescope 35, the reading being taken from the positions oi' theedge` i3 oi the base relatively to the graduations on the base plate 50.

`rlhis instrument provides 'a small, compact, portable device for use by engineers, topographers, architects, masons, mechan ics, carpenters and the like 'for measuring' inclinations and angles and tor ascertaini f' distances and heights. The makinget U instrument in the form ot a small 4tov 'to the education and amusement of chih n i also contemplated.

The arm 20 in conjunction with the may also be used as a draftsmans triangle in translating dierent measured angles to pa er.

llajving thus described my invention,

what l claim as new and desire to secu byy steers Patent, iszl l. ln a combination level and angle meas uringinstrument, a base havingl recesses at opposite ends, an arm pivotall-y secured to the base in one ot said recesses, a level carried by said arm, a graduated arc-shaped strip pivotally attached to the base in the other or" said recesses and adapted to be moved to. operative or `folded position, and a pointer fixed to said arm and provided with a slot to receive saidstrip when in tolded position.

:2. ln a combination level' 'and angle measuring instrument, a base having' a recess at each end, armi pivotal'ly secured to the base in one of said recesses, a l carried by said arm, a graduated arc-shaped strip pivotally attached to the base in the other ot said recesses and adapted to be moved operative or to folded position, a slotted pointer carried by said arm for receivinff said strip, and a pin projecting from said base Yfor limiting the outward movement of said strip in the operative position.

8. ln a combination level and angle meas uring instrument, a base means for measu ing vertical angles pivo'tally supportedA lin; said base, a level carried by said means4 and a. graduated plate upon which said base is pivotally mounted, said base having a rece-.es ot which one edge cooperates with the graduations on said plate 'for indicating t-e angular position of the base on said plate.V

4. ln a combinationlevel and angle meas uring instrument, a base, means for mea-sun ing vertical angles including an arm and an vel tok

lil() arc-shaped graduated strip pivotally sup- I ported b-y said base a pointer carried by said arm and associated with said strip, a level and a telescope carried by said arm, said telescope having its optical axis parallel to the axis of the pointer.

5. In an instrument of the type described, a graduated bed plate, a base pivotally mounted on said bed plate, and having means cooperating with the-graduations on the bed plate, a movable arm carried by said base adapted to he folded into contacttherewith, a `level carried by said arm, a graduated arc-shaped strip over which said arm is movable :tor indicating vertical angles,

- and a telescope mounted on said arm having its optical axis in the same plane with the vertical axis ofthe pivotal 'support of said base, whereby after the levelingo-f the arm and base7 objects may be sighted through the telescope andthe horizontal angle between said objects determined by the corresponding `readings betweenthe base and the v raduations of the bed plate, and objects of ierent elevations may be sighted and the'- the combination of a base, a graduated arcuate strip pivotally connected to and adapted to be folded on the base, a horizontal graduated plate on which the lbase is pivotally supported, means carried by said base yand associated with the graduations on said plate for indicating the angular position'otl said base with reference to lsaid plateyan arm pivotally connected to said' base, andl means carried by said arm and cooperating with the graduations on said strip to indicate the angular position of said arm relatively to said base.

In testimony whereof l have hereunto set my hand in presence of two subscribing witnesses.

ENRIQUE G; DOERINGv HARMSEN. i

Witnesses C. KROLL, W. HOLZ. 

